You’re not listening. I said “port for port”. Take the valve angle out of it, and the SBC PORT is better. The 18 degree valve angle is what makes the weaker SBM port make more power.
You can’t just look at one aspect of any head and claim one is better than the other without looking at valve angle, port angle, cross section, chamber shape, plug location, pushrod pinch etc. It all adds up.
Again, port for port, the SBC port is better.
I watched that video. There was much that UT nailed. He has figured out that building big inch small blocks with OE architecture is a bad thing. Something I’ve known for decades, and have written many times here.
That’s the biggest take away from that video.
His flame test is iffy at best. It takes about 15 minutes on a flow bench using various pressure drops to see the issues with the SBM exhaust ports.
